NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES
OSTŘÍŽEK, Petr, Petr BEZDIČKA, Zdeněk MORAVEC and Jiří PINKAS. NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES. In ChemZi. 2009. ISSN 1336-7242. |
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Basic information | |
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Original name | NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES |
Name in Czech | Příprava nanoskopických částic kobaltových ferritů sonolýzou acetylacetonátových komplexů kovů |
Name (in English) | NANOSCOPIC COBALT FERRITE PARTICLES BY SONOLYSIS OF METAL ACETYLACETONATE COMPLEXES |
Authors | OSTŘÍŽEK, Petr (203 Czech Republic, belonging to the institution), Petr BEZDIČKA (203 Czech Republic), Zdeněk MORAVEC (203 Czech Republic, belonging to the institution) and Jiří PINKAS (203 Czech Republic, guarantor, belonging to the institution). |
Edition | ChemZi, 2009. |
Other information | |
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Original language | Czech |
Type of outcome | Conference abstract |
Field of Study | 10402 Inorganic and nuclear chemistry |
Country of publisher | Slovakia |
Confidentiality degree | is not subject to a state or trade secret |
RIV identification code | RIV/00216224:14310/09:00051212 |
Organization unit | Faculty of Science |
ISSN | 1336-7242 |
Keywords (in Czech) | nanočástice; kobalt; ferrity; sonolýza; acetylacetonáty |
Keywords in English | nanoparticles; cobalt; ferrites; sonolysis; acetylacetonates |
Tags | IK, rivok |
Tags | International impact |
Changed by | Changed by: Iva Klímová, učo 58563. Changed: 5/4/2012 10:21. |
Abstract |
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Previously we studied the preparation of Fe2O3 and Co3O4 nanoparticles by sonolysis of 2,4-pentanedionato complexes, M(acac)n, M = Fe, Co. Now we continue this research with the preparation of mixed metal oxide CoFe2O4. Sonochemical decompositon of mixtures of M(acac)n by high intensity ultrasound lead to amorphous Co ferrite nanoparticles containing organic matrix. The sonochemical reactivity of precursors was: Co(acac)2 > Fe(acac)3 > Co(acac)3. The XRD data showed that phase-pure CoFe2O4 were obtained for Co:Fe ratios of 1:1.3 to 1:2.0. Variable amounts of added water allowed control of the organics content and the BET surface area (up to 218 m2 g-1). SEM was used to examine the particle shape, size, and size distribution. The organic groups present in the powders were identified by IR and MS as acetate groups. TEM study showed the amorphous state of the sonochemical oxide product and its crystallization above 300 oC in agreement with the results of TG/DSC. The HT-XRD also revealed the spinel crystallization on heating. A small particle size below 20 nm of the crystalline CoFe2O4 is retained up to 600 oC. The delayed crystal growth is ascribed to the protective action of a thin surface layer of pyrolyzed organics. |
Abstract (in English) |
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Previously we studied the preparation of Fe2O3 and Co3O4 nanoparticles by sonolysis of 2,4/pentanedionato complexes, M(acac)n, M = Fe, Co. Now we continue this research with the preparation of mixed metal oxide CoFe2O4. Sonochemical decompositon of mixtures of M(acac)n by high intensity ultrasound lead to amorphous Co ferrite nanoparticles containing organic matrix. The sonochemical reactivity of precursors was: Co(acac)2 > Fe(acac)3 > Co(acac)3. The XRD data showed that phase-pure CoFe2O4 were obtained for Co:Fe ratios of 1:1.3 to 1:2.0. Variable amounts of added water allowed control of the organics content and the BET surface area (up to 218 m2 g-1). SEM was used to examine the particle shape, size, and size distribution. The organic groups present in the powders were identified by IR and MS as acetate groups. TEM study showed the amorphous state of the sonochemical oxide product and its crystallization above 300 oC in agreement with the results of TG/DSC. The HT-XRD also revealed the spinel crystallization on heating. A small particle size below 20 nm of the crystalline CoFe2O4 is retained up to 600 oC. The delayed crystal growth is ascribed to the protective action of a thin surface layer of pyrolyzed organics. |
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MSM0021622410, plan (intention) | Name: Fyzikální a chemické vlastnosti pokročilých materiálů a struktur |
Investor: Ministry of Education, Youth and Sports of the CR, Physical and chemical properties of advanced materials and structures |
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